.div1 {
  width: 0px;
  height: 0px;
  border-width: 100px;
  border-color: blue transparent transparent transparent;
  border-style: solid;
  display: inline-block; }

.div2 {
  width: 0px;
  height: 0px;
  border-width: 100px;
  border-color: transparent transparent red transparent;
  border-style: solid;
  display: inline-block; }

.div3 {
  width: 0px;
  height: 0px;
  border-width: 100px;
  border-color: transparent transparent transparent green;
  border-style: solid;
  display: inline-block; }

.div4 {
  width: 0px;
  height: 0px;
  border-width: 100px;
  border-color: transparent black transparent transparent;
  border-style: solid;
  display: inline-block; }
